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70
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Sequence of Operation
•
When the supply air temperature is 5.0° F or more
above the cooling
“VAV UPPER COOLING SAT
SETPOINT”
or
“VAV LOWER COOLING SAT
SETPOINT”
the Simplicity Control will energize
the fi rst compressor.
•
The control records the supply air temperature
right before the compressor is turned on and
compares it to the supply air temperature after 5
minutes of operation.
•
A second compressor will be turned if both of
the following criteria are met:
– The supply air temperature is still 5.0° F or
more, greater then the
“VAV UPPER COOL-
ING SAT SETPOINT”
or
“VAV LOWER
COOLING SAT SETPOINT”
.
– The Simplicity Control uses the temperature
difference calculated when the fi rst compres-
sor was turned on to verify the supply air tem-
perature will not drop 5.0° F or more below
the cooling
“VAV UPPER COOLING SAT
SETPOINT”
or
“VAV LOWER COOLING
SAT SETPOINT”
. If turning on a compressor
would result in the specifi ed drop in supply
air temperature, the second compressor will
not be turned on.
•
The same logic will be used to stage on compres-
sor 3 and 4.
The Simplicity Control turn off compressor operation
as follows:
•
The supply air temperature is 5.0° F or more
below the
““VAV COOLING SUPPLY TEMP
UPPER SAT SETPOINT”
or
“VAV COOLING
SUPPLY AIR TEMP LOWER SETPOINT”
.
•
It has been more than 5-minutes since the last
compressor was turned on.
•
The compressors will be turned off in the reverse
order they were turned on.
Cooling – Unoccupied with a Hard Wired or Com-
municated Space Sensor
The Simplicity Control cannot operate unoccupied
cooling with this method of control.
Heating – Occupied with a Hard Wired or Com-
municated Space Sensor
The following parameter must be programmed into the
Simplicity Control:
•
“VAV OCCUPIED HEATING ENABLED”
– This
must be turned on using Parameter 26 under the
PROGRAM key on the Simplicity control board
or under the HEATING SETUP tab in the Sim-
plicity PC software package.
•
“MORNING WARM-UP/ VAV RETURN AIR
TEMP SETPOINT”
– using Parameter 29 under
the PROGRAM key on the Simplicity control
board or under the HEATING SETUP tab in the
Simplicity PC software package.
•
“VAV OCCUPIED HEATING SETPOINT”
– us-
ing Parameter 27 under the PROGRAM key on
the Simplicity control board or under the HEAT-
ING SETUP tab in the Simplicity PC software
package.
The unit will initiate Occupied Heating when the
following criteria is met:
•
The space temperature is 2.0° F less than the
“VAV OCCUPIED HEATING SETPOINT”
.
•
The return air temperature is 0.1° F below the
“MORNING WARM UP / VAV RETURN AIR
TEMP SETPOINT”
.
The unit will terminate Occupied Heating when the:
•
The return air temperature is equal to the
“MORNING WARM UP RAT SETPOINT”
.
The
“VAV OCCUPIED HEATING SETPOINT”
should
always be set below the
“MORNING WARM UP RAT
SETPOINT”
.
Heating – Unoccupied with a Hard Wired or Com-
municated Space Sensor
The Simplicity Control cannot operate unoccupied
heating with this method of control.
Summary of Contents for ECO2 YPAL 050
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Page 113: ...113 JOHNSON CONTROLS FORM 100 50 NOM6 1207 6 ECONOMIZER EXHAUST LD13018...
Page 114: ...114 JOHNSON CONTROLS FORM 100 50 NOM6 1207 User Interface Control Center FANS LD13019...
Page 115: ...115 JOHNSON CONTROLS FORM 100 50 NOM6 1207 6 COOLING SETUP LD13020...
Page 117: ...117 JOHNSON CONTROLS FORM 100 50 NOM6 1207 6 HEATING SETUP LD13022...
Page 119: ...119 JOHNSON CONTROLS FORM 100 50 NOM6 1207 6 SYSTEM OPTIONS LD13024...
Page 121: ...121 JOHNSON CONTROLS FORM 100 50 NOM6 1207 6 INPUTS COMFORT DEMAND VENTILATION LD13014 LD13026...
Page 125: ...125 JOHNSON CONTROLS FORM 100 50 NOM6 1207 6 ALARMS LD13031...